NASHVILLE (AP) - Two environmental groups have filed a federal lawsuit against the owner of a metals recycling yard in downtown Nashville, claiming stormwater runoff is polluting the Cumberland River.

The Tennessean (http://tnne.ws/13c1KLA) reported that PSC Metals issued a statement that the lawsuit is without merit because it is based on outdated information.

The lawsuit filed in April by the Tennessee Environmental Council and Rediscover East!, says clean water enforcement by the state and city governments has been inadequate.

"We only filed the lawsuit because we didn't see any action taken," said Kelly Poole, a lawyer with the Tennessee Environmental Council. "Not enough is being done by anyone to protect our drinking water."

The company said it is environmentally responsible.

"Throughout its facilities, PSC has invested millions of dollars in the most effective, safe and environm entally compliant equipment," the statement reads.

A review of records by The Tennessean found PSC had exceeded the concentration limits for metals in at least eight of the last 10 years. The metals include lead, zinc and copper.

The scrapyard is on east bank of the river, next to LP Field and across the river from Nashville's downtown district.

The newspaper found only one $500 fine levied against PSC Metals. Department of Environment and Conservation spokeswoman Meg Lockhart said fines are only one method of enforcement, the others being outreach and technical guidance.